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FINANCIAL HIGHLIGHTS (Details) - $ / shares
 9 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Per Share Operating Performance:    
Net asset value, beginning of period $ 9.59 $ 12.08
Total income (loss) 1.76 3.46
Total expenses (0.07) (0.07)
Net increase (decrease) in net asset value 1.69 3.39
Net asset value, end of period $ 11.28 $ 15.47
Total Return 17.62% 28.06%
Ratios to Average Net Assets    
Total income (loss) 21.52% 25.82%
Management fees [1] 0.45% 0.45%
Expenses excluding management fees [1] 0.35% 0.27%
Net income (loss) 20.92% 25.27%
[1] Annualized.